The Marxism stuff comes from the Social Science departments of universities - It follows on from the failure of Marxism to be accepted and it includes sociological dogma such as Critical Race Theory. It has found its way into what we call the establishment (all political parties, education, civil service, armed forces, courts, police, NHS, local authorities, commerce etc). An example is the new obsession with what they call "diversity". Douglas Murray explains very well who the Marxist woke mob are in his books e.g. these two:
"The Madness of Crowds: Gender, Race and Identity"; THE SUNDAY TIMES BESTSELLER
"The War on the West"
If you want a quick video of Douglas try this (under 10 minutes):
https://www.youtube.com/watch?v=gsNz2OkeoDA